Neocrepidolithus
Classification: ntax_cenozoic -> Mesozoic Survivors -> Chiastozygaceae -> Neocrepidolithus
Sister taxa: Jakubowskia, Neocrepidolithus, Staurolithites, Zeugrhabdotus
Daughter taxa (time control age-window is: 0-800Ma) |
 |  |  |  | Neocrepidolithus cohenii
Unicyclic Neocrepidolithus with closed central area.
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 |  | | | Neocrepidolithus cruciatus
Neocrepidolithus with narrow central area filled with an axial cross. Clearly bicyclic in LM.
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 |  |  | | Neocrepidolithus dirimosus
Bicyclic Neocrepidolithus with closed central area.
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 |  |  | | Neocrepidolithus fossus
Neocrepidolithus with broad rim and narrow to closed central area. No obvious central structures and unicyclic in LM.
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 |  |  |  | Neocrepidolithus grandiculus
Medium to large Neocrepidolithus with a broad rim, unicyclic in XPL, and a narrow, vacant central area. The central area width is variable, usually around the same width as the rim, but may be narrower or closed.
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 |  |  |  | Neocrepidolithus neocrassus
Neocrepidolithus with bicyclic LM image and narrow to closed central area.
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 |  |  |  | Neocrepidolithus sp.
Specimens which cannot be assigned to any established species
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Taxonomy:
Citation: Neocrepidolithus Romein, 1979Rank: GenusType species: Crepidolithus neocrassus Perch-Nielsen, 1968Taxonomic discussion: Includes a number of species that are very similar and may represent synonyms (e.g. N. coheni, N. neocrassus and N. fossus).
Distinguishing features: Murolith (loxolith) coccoliths with broad, high rim and narrow or closed central-area, which may be spanned by bars.
Farinacci & Howe catalog pages: Neocrepidolithus *
Size: Most species are 4-7 µm long (ie. medium size) the prime exception is N. grandiculus which is much larger (7-13.5 µm)
Search data:
| Tags | LITHS: murolith, |
| Metrics | Lith size: 4->13.5µm; |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Last occurrence (top): in lower part of Ypresian Stage (28% up, 53.7Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Turonian Stage (0% up, 93.9Ma, in Turonian stage). Data source: Total of range of species in this database
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Chiastozygaceae
References:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O
Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs V O
